All Members Read - Classifieds system

I've been doing some brainstorming about the site. What does everyone think about an update to the marketplace system?

Marketplace for usersI'm thinking of putting in a different system for the marketplace that will allow for free user-to-user auction listings plus sections that contain vendor offerings that you can look at and compare prices for items.

Vendor products tooThe benefit is that you will be able to see product offerings for all of the big boys stuffs, oem parts and mainstream aftermarket too. However, you would also be able to see products from up-and-coming vendors and manufacturers that are making products for your GM.

Feedback!I'd have to see what the best way to go on this is, and it would take some time and resources to get built but I think that some format of something like this would work very well. What does everyone think?
Ideas?

1) User-to-user Auction System. Would you buy, sell, trade, barter with others on GMTC is there were a better auction system online?

2) Product search auction - eBay like. Would you look at products and services in a better (eBay-style) auction system that was just about GM products with a heavy focus on Chevy Trucks and SUVs? So you could look at new OEM parts, new major manufacturer aftermarket parts, major manufacturer replacement parts and small manufacturer aftermarket parts. -- This would cover everything from wipers to tires to radios to bumpers and winches.